Test Step 5 - O2 Sensor Signal Circuit

• Using the wiring diagram/schematic as a guide, inspect the O2 sensor signal circuit and connectors between the O2 sensor and the PCM.
• Check the O2 sensor signal circuit for a short to ground, open circuit, short to voltage, or high resistance.

Were any problems found?

Yes

• Repair as necessary.
• Perform the PCM Verification Test. Refer to PCM VERIFICATION TEST .

No

• Go to Test Step TEST STEP 6 - O2 SENSOR RETURN CIRCUIT .